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1.
A meeting at work when your attendance is mandatory but ultmitaley pointless and a waste of everyones time.
Luke - "Are you coming to the pub at lunchtime ?"

Terry - "I can't I have got a 3 Oclock JagJet"
by NotAnnuvvaOne September 21, 2010
 
2.
Jag Jet is when you go to the toilet after drinking too much Jagermeister and have a Jet stream of Jager Poop come out your anus.
My god terry, I had far too much Jager last night. The jag jet i got this morning was catastrophic.
by condorman1 September 23, 2010